This blog features my weekly column called "What's up in the sky". It is published every Saturday in the Ellensburg newspaper, Daily Record (http://www.kvnews.com/). While my postings will be most accurate for Central Washington, readers throughout the northern USA may find something of use.

Thursday, June 29, 2017

The Ellensburg WA sky for the week of 7/8/17

Saturday: Being
in a coma is a bad thing. Looking at the Coma Star Cluster is a good thing. The
Coma Star Cluster is an open cluster of about 50 stars that takes up more space
in the sky than 10 full Moons. It looks like a fuzzy patch with the naked eye.
Binoculars reveal dozens of sparkling stars. A telescope actually diminishes
from the spectacle because the cluster is so big and the telescope’s field of
view is so small. The Coma Star Cluster is in the faint constellation Coma
Berenices (ba-ron-ice’-ez) or Queen Berenice’s hair. Queen Berenice of Egypt
cut off her beautiful hair as a sacrifice to the gods for the safe return of
her husband Ptolemy III from battle. The Coma Star Cluster is about four fists held
upright and at arm’s length above the west horizon at 11:00 p.m.

Sunday: Look
straight up at midnight. The head of Draco the dragon will be looking straight
down on you. The brightest star in the head is called Eltanin. If you chose to
wait a VERY long time, Eltanin will be the brightest star in the night sky.
Currently 154 light years away, it is moving towards Earth and will be only 28
light years away in about 1.3 million years, claiming the title as brightest
star.

Monday: The
elusive Mercury is a half a fist above the west-northwest horizon at 9:30 p.m.
At this same time, Jupiter is two and a half fists above due southwest.

Tuesday: Last
week, I wrote about Mizar. This week, I need to warn you not to confuse Mizar
with its rhyming brother Izar in the constellation Bootes. Izar is also a
binary star with about the same apparent brightness. And both were featured in
different episodes of Star Trek. Izar was featured in the Star Trek episode
“Whom Gods Destroy” from the original series. It is the base of Fleet Captain
Garth, a former big shot in the federation and one of Kirk’s heroes before he
went insane. Garth kidnaps Kirk and Spock before eventually being out smarted.
Mizar doesn’t play as big a role in its episode. It is the star of the home
world of one of the alien species in The Next Generation episode “Allegiance”.
Izar is one fist above the bright star Arcturus and seven fists above the south
horizon at 10 p.m. Mizar is seven fists above the northwest horizon at this
time.

Wednesday: Saturn is two fists above the south horizon at 11 a.m.

Thursday: What you see with the naked eye isn’t all that can be seen. While
astronomers can learn a lot from observing the sky in the visible wavelengths,
many celestial objects radiate more light, and more information, in wavelengths
such as radio, microwave, infrared, ultraviolet, x-ray, and gamma ray. In 2012,
NASA launched the Wide-field Infrared Survey Explorer (WISE) to study objects
that radiate in the infrared range such as asteroids, cool dim stars, and
luminous galaxies. For an interesting comparison of how different wavelengths
show different aspects of celestial objects, go to http://goo.gl/nvuax. For
example, if it weren’t for infrared telescopes such as WISE, astronomers would
not know about the significant amount of dust in galaxies.

Friday: Venus
is one and a half fists above the east horizon at 4:30 a.m. The bright star
Aldebaran is about a half a fist to the lower right of Venus.

The
positional information in this column about stars and planets is typically
accurate for the entire week. For up to date information about the night sky,
go to https://nightsky.jpl.nasa.gov/planner.cfm.